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Keyboard doesn't work in LXDE (Debian)

Posted: Wed May 30, 2012 11:10 am
by DanielOBrien
Just received my PI yesterday. I had already D/L Debian image and put it on a flash card. Plugged in my HDMI monitor, ethernet, mouse/keyboard, power, and it booted right up. Was able to login fine, but when I started X (startx), the keyboard fails to work thereafter. Nothing types. Mouse works fine. And then when I log out of X and return to the command line, no more typing on the keyboard.

What am I missing?

Re: Keyboard doesn't work in LXDE (Debian)

Posted: Wed May 30, 2012 1:29 pm
by RMW5
Could be a power problem. LXDE consumes more power than just running the console and that could be pushing you into dangerous territory. For more information read here.

http://elinux.org/Rpi_Hardware#Power_Supply_Problems

If you can swap your power supply for one more highly specced, try that. If you have a lot of peripherals, try it with as many removed as possible, or move them to a powered hub with a regulated power supply.

If you have a voltmeter, try measuring the voltage between TP1 (between the power and HDMI sockets) and TP2 (right of the GPIO) as described in the link.

Re: Keyboard doesn't work in LXDE (Debian)

Posted: Wed May 30, 2012 11:43 pm
by Dandapani
Thanks. I purchased a more beefy powersupply. I will give it another go. If still fails will measure the voltage as suggested.

Re: Keyboard doesn't work in LXDE (Debian)

Posted: Thu May 31, 2012 11:30 pm
by Dandapani
The "beefy" PS is rated at 1.4A, but it won't carry any accessories. With just the E-Net, I'm getting only 4.52 volts. It does run headless, but it's still below optimal.

Re: Keyboard doesn't work in LXDE (Debian)

Posted: Thu May 31, 2012 11:39 pm
by jbeale
4.5 V is definitely in the danger zone, the TP1-TP2 voltage should be 4.75 to 5.25 V.

There is also documented software problem about some kind of interference or bad interaction between LXDE and a mix of high and low-speed USB devices (for example a mouse and a WiFi dongle). This may be related to the reported issue, see:
http://www.raspberrypi.org/phpBB3/viewt ... ifi#p88682